A mixture of 3.00 gram-moles of benzene and 7.00 gram-moles of toluene are placed in a closed cylinder equipped with a piston. The cylinder is immersed in a bath of boiling water that maintains the temperature at 100.0C. The force exerted on the piston can be varied to adjust the cylinder pressure to any desired values. The pressure is initially 1300mmHg and is gradually lowered to 600mmHg. Use the Pxy diagram below to convince yourself that the cylinder initially contains only liquid benzene and toluene and to answer the following questions. At what pressure does the first vapor bubble form? mmHg What is its composition? mol benzene/mol